When managing guest accounts, you need to create a guest account policy and set the account creation method. For the account creation method, which of the following descriptions is wrong?
A . When adding accounts individually, you can choose to create them individually.
B . If there are many users, you can choose to create them in batches.
C . If the number of users is relatively large, you can choose database synchronization.
D . In order to facilitate management and improve user experience, self-registration can be used.